DC and Brushless motors

Discussion in 'The Projects Forum' started by KansaiRobot, May 24, 2010.

  1. KansaiRobot

    Thread Starter Active Member

    Jan 15, 2010
    318
    5
    Hello everybody and thanks for the help.

    I have a new project in which I am working and would like to know the difference between DC and Brushless (brushless DC??) motors. Specially concerning how should I control them from a microcontroller.

    In few words what is different about them?


    Any push in the right direction would be very appreciated

    Kansai
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,344
  3. KansaiRobot

    Thread Starter Active Member

    Jan 15, 2010
    318
    5
  4. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,672
    899
    Yes, it is for brushed ("blashed") motors. You need to give more information about your application and motor size before much more advice can be given. Why have you decided against brushless motors?

    John
     
  5. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,534
    Brushless motors typically don't have the surge and torque from a standstill. In the combat robotics club I was in the guys with the big machines talked about a stall current of 500A until it started moving, but the torque was equivalent to the power consumed.
     
    SgtWookie likes this.
  6. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Nice post, Bill.

    Brushless DC motors have dominated PC fans for the last decade or so. It's a near-perfect application, as fans usually have a very light starting load; just the weight of the fan rotor/blades itself. The load increases as the motor speed increases, which is a very good match for a BLDC.
     
  7. KansaiRobot

    Thread Starter Active Member

    Jan 15, 2010
    318
    5
    Well, I know it is not a good reason but basically because I have understood H-bridges and connecting it to a DC Motor. Although I understand the "theory" behind brushless motors, I cant find a good source on how to control these.

    the motor I am thinking on using is a small DC motor for pumping. 25mmx 31 mm with a drive voltage of 6~12V. basically i want to control the amoung of discharge pressure the motor generates.

    I have the option to use a brushless motor of similar characteristics but as I said I havent found a way to control it.
     
Loading...